Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Be a better location for a ski run than the south-facing side
Grow a variety of trees that are typically observed at higher elevation
All of these
Have snow on the ground for a longer period of time in winter compared to the south-facing side
Receive less sunlight during a year than the south-facing side

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

Saturation vapor pressure decreases with increasing altitude
The temperature of the boiling water decreases with increasing altitude
There is less oxygen in the air at high altitude
Water boils at a higher temperature with higher altitude

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